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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80530fe85200c65dbd2ee5ccb2b6ff8d93f941be056fb13813035da4407b76db' 
  AND token = '1JgLnSMk7cX9Gz/1wRqU6t/TRhf6WFQw/75u4V+wyq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}